Albert wedeemakn



(No Model.)

A. WBDERMANN.

SEWING MACHINE.

Patented Apr. zo, 1886.A

N. persas, Phmumgnph". wmingwn. D. cA

lliure STATES ATENT OFFICE.

i ALBERT WEDERMANN, F VIENNA, AUSTRIA-HUNGARY.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 340,178, dated April 20, 1886.

Application tiled December 15, 1585. Serial No. 185,716. (No model.) Patented in Germany May 3, 1885, No. 33,298.

To all whom it may concern:

Be it known that I, ALBERT WEDERMANN, of Vienna, Austria-Hungary, have invented a new and useful Improvement in Sewing- Machiues, (for which I have obtained a patent in Germany, No. 33,298, dated May 3, 1885,) of which the following is a specification.

This invention relates to improvements in sewing-machines, and especially to a device which manipulates the feeder in such a manner that the threads connecting alternate stitches cross each other so that a whipped or overcast seam is produced. y y

The invention is fully explained with reference to the annexed drawings.

Figure lis a side View of the upper part of a -sewing-machine provided with these improvements. For the sake of clearness, the foremost standard is omitted and the main arm of the machine as well as the needle-bar lever are merely indicated. Fig. 2 is a plan ofthe Sallie. Figs. 3, 4, 5, and 6 are details. Fig. 3 is a front view ofthe cylinder, its toothed wheel, andthe Figs. 4, 5, and 6 will be eX-' toothed segment. plained hereinafter.

Upon the arbor a of the driving-wheel, which arbor has its bearing in the main arm of the machine, is mounted a toothed wheel, b, which meshes with a second toothed wheel, c, of a diameter twice as large as that ofthe former. The arbor d ofthe latter wheel has its bearings in the two standards, c. This upper larger wheel is provided with an ecceutrically-curved groove, f, in which runs a friction-roller, g, held by a bar, t, which is provided with the yoke lz, (giving room to the wheel 0,) and which is capable of turning around the studs It', having their bearings in the standards e. (Fig. 6 represents a perspective view of this bar i, yoke h, roll g, and studs k.) This bar t' is connected to a rod or pitman, l, by means of a link, m, forming at m a sleeve capable of being shifted along the bar t', while at m a simple hinge secures the requisite mobility of the bar l. At its opposite end the bar or pitman l is connected to a toothed segment, p, adapted to turn around the pivot o. This pivot o is mounted on a separate support, y1', expressly iixed for the purpose on the sleeve g of the cylinder, Fig. 3. The toothed segment p meshes with a toothed wheel, s, which is keyed to the cylinder proper, t, of the machine, to which the cloth-feederv or f transporteur77 u is rigidly connected. This cylinder t has its bearings inside of the sleeve, and can turn freely.

The apparatus works as follows: Supposing the driving-wheel A and with it the toothed wheel b are turned around in the direction of the arrow l, (which may be effected by treadle, hand wheel, steam or water power, &c.,) then the upper toothed wheel, c, will turn in opposite direction, and by virtue of its curved groove will act upon the `frictionroller g of bar z' in such a manner that this latter bar will turn in the direction of the arrow 2-namely, to the right-and consequently will also move the bar Z to the right, and that during all the time which it takes for the lower wheel to make a complete revolution (or for the upper one to make half a revolution) during the second complete revolution of the lower wheel (or the second half-revolution of the upper wheel) the peculiar shape of the groove effects that the whole mechanism (exclusive of the two toothed wheels b and c) is moved in opposite direction-that is to say, retracted in the direction of the arrow 3. Consequently during two revolutions of the driving-wheel the toothed segment p, which meshes with the toothed wheel s, will have brought the cloth-feeder successively into two diliferent positions, as

shown in Fig. 4, in consequence of which the needle executes cross-stitches, Fig. 5, which are suitable for producing awhipped or overcast seam.

It is understood that the angle inclosed by the threads connecting alternate stitches may be decreased or increased by adjusting or moving the connecting-link m along the bar i, so that any desirable form of cross-stitches may be produced, as shown in Fig..5. It is also evident that the details of construction may be varied without departing from the nature of this invention.

)Vhat l claim isln a sewing machine for producing a whipped or overcast seam, the combination IOC of the toothed wheel b, the toothed wheel c, In testimony whereof' I have signed 'this provided with groove f, the bar i, provided i Specification in the presence of two subscribwith the roll g, yoke h, and studs It, rod Z, f ing witnesses.

provided with the links m m mi, toothed seg- ALBERT VEDERM ANN. 5 ment p, toothed wheel s, cylinder t, sleeve q, Witnesses:

and cloth-feeder u,substantial1y as and for EDMUN JUssEN,

the purpose described. SAMUEL VVERTHERI. 

